for all you 80 dudes 1hdt

[BURGER]

http://outerlimits4x4.com/PHP_Modules/phpBB2/viewtopic.php?t=70030&sid=2f6feb665bc4fb7086025ba06470d8f1



I am going to crank my 12-ht to 20psi and see whats up!

 

[Radd Cruisers]

Freken WOW.

Goes to show you what one of those engines is capable of, cannot wait for the pics of this unit.

 

[crushers]

sounds like he needs some propane to burn the rest of the unused oxygen...
;^)

 

[Tapage]

sounds like he needs some propane to burn the rest of the unused oxygen...
;^)

Agree .. but also a psico test ..

Anycase .. wooouu !

 

[lowenbrau]

Intercooling would help a bunch. If he's making 550C he's still got enough fuel. Propane would likley help drop the EGTs as well.

I wonder what will break when something finally does? There's no way the main bearings are coming apart. Its hard to imagine how many Horsies it would take to throw a big rod like that.

 

[R2HKS]

I want to see some pics of that. Good to see some people finally pushing some hp and most likely insane torque out of Toyota Diesels. This forum is very conservative to say the least. Especially the response I got from wanting to run 20psi in my 3B LOL.

Be interested to see how you go burger pushing 20PSI through yours keep us updated.

I have also thought about running a twin turbo setup, using experience I have with Nissan GTR twin turbos. Though I would probably use a different setup using 2 small turbos rather than a small turbo and a larger turbo. Running up to 30psi each turbo.

I hope that guy has changed his big end bearings. Some models of the 1HDT had dodgy bearings and I would say a big end bearing would be the 1st to go or possibly a cracked piston. Though you never know until you try.

 

[Radd Cruisers]

Yanmar is closing on 400HP, not sure of the torque numbers. Should take a fair beating before something brakes.

Somebody on outlimits had spoken about cracking in the heads??

 

[HZJ60 Guy]

Ok, so the real question is, how long will that engine hold up? Ok so if you're going to dragg that thing then cool, but who cares if the engine blows out on you in the Alaska trek?????

 

[crushers]

i highly doubt you would be using that kind of horsepower driving down the road, you have to remember the only time he will see 20 psi is when his foot is buried through the floor boards, otherwise he will be running about 9-12 psi on average...
cheers

 

[Greg_B]

I am going to crank my 12-ht to 20psi and see whats up!

What's up would be intercooler time. Would be interesting to see the temp of the air going in at that level above atmosphere, and how long a bushing style turbo would last.

gb

 

[R2HKS]

They are steel wheels aren't they? As long as they aren't ceramic wheels it should be able to handle 20psi. Though it probably past the peak effiency, which an IC would help with. Doesn't necessarily mean it can't still make more power. It could probably go as high as 25psi before it can't flow anymore air, maybe even higher.

 

[crushers]

i was told that bearing turbos are recommended once past the 18 psi mark...
but then how long would the boost be up to 20 psi anyway...

 

[R2HKS]

No not true. Old skool non ball bearing turbo's can easily run past 20psi. Its more to do with what the wheels are made out of. As long as they are steel wheels there is no problem.

The new garrett BB turbo's are designed to be more effecient past 18psi. The way they are made and designed they need to run more boost through them to make there designed effeciency. It has more to do with the wheels and how they are designed than the bearings themselves. That's why you don't see the true potential of a BB Garrett until you get over 18psi. 14psi say is a waste of time if that's the max boost you are going to run on a BB Garrett, you may as well run a non BB turbo because they are designed to be more effecient at lower boost.

 

[crushers]

That's why you don't see the true potential of a BB Garrett until you get over 18psi. 14psi say is a waste of time .

agreed...

 

[Radd Cruisers]

The Yanmar runs at 3000 rpms all day long, it digs in hard.

Again to mention the intercooler is running ice cold sea water which is a hudge advantage over anything street.

Like one of the turbo guys said, (if true) the intercooler is to drop temps and reduce wear caused by heat.

 

[brownbear]

Like one of the turbo guys said, (if true) the intercooler is to drop temps and reduce wear caused by heat.

also to increase the density of the air charge. cooler dense air doesn't have to be at higher PSI as compared to less dense heated air.....

 

[R2HKS]

Well his setup is seriously flawed. He's trying to push all the air from the big turbo through the small turbo and that's why he made a pittly gain in power. Not to mention he is running both turbo's way past their efficiency ranges and must be creating mega heat with no intercooler/s.

That type of setup just won't work because the small turbo can only flow so much air, obviously no more than 125 awkw. Also I bet if he turned the boost down he may make more power than he is but that small turbo can only flow so much.

He should either reverse the system and run the small turbo through the large turbo or separate the 2 altogether.

I can tell you now his maths don't work and that project is a failure and he has it all wrong.

 

[denis]

He should either reverse the system and run the small turbo through the large turbo or separate the 2 altogether.

.

I disagree.

Every dual stage compression system I've seen so far had the big compressor feeding the small, that includes engines as well as industrial compressors. Because the air is already compressed in the first stage the second stage can be a little, or a lot smaller depending on the pressure ratio of the first stage.

Looks like his problem is fuel quantity and/ or bosst compensator adjustment.